Watch-crystal gauge



M. GORDON.

WATCH CRYSTAL GAUGE.

APPLICATION HLED SEPT.9,1920.

1 ,404;,601 Patented Jan. 24, 1922.

Pig-1 IN V EN TOR.

@AMJMZM W ATTORNEYS.

UNITED STATES MAX GORDON, OF WATERBURY, CONNECTICUT.

WATCH-CRYSTAL GAUGE.

Specification of Letters Patent.

Patented Jan. 24, 1922.

Application filed September 9, 1920. Serial No. 409,125.

To all whom it may concern:

Be it known that 1, MAX GORDON, a citizen of the United States, andresident of Waterbury, in the county of New Haven and State ofConnecticut, have invented certain new and useful Improvements in-Watch-Crystal Gauges, of which the following is a specification.

The present invention has for its object to provide an accurate gaugefor watch crystals which shall be extremely simple in construction andcheap to manufacture, and which shall also be of practical design forits purpose and thus capable of easy and ready manipulation in theperformance of the work for which intended.

With the: above and other objects in view, the invention comprises theconstruction and arrangement of parts as now to be fully described andhereinafter specifically claimed.

in the accompanying drawing forming a part of this specification,

Fig. l is a top plan view of the gauge of the invention;

l1 ig. 2 is an edge view thereof;

Fig. 3 is a perspective view showing a portion of the flexible band ofthe gauge; and

Fig. 4; is a sectional view on line el-4E in Fig. 2. looking in thedirection of the arrows, but showing section of a watch crys tal inposition in the hoop of the. flexible band.

In the accompanying drawing, 10 denotes a scale of any suitablematerial, such as wood or steel, and 11 and 12 denote graduationsthereon. The graduations may correspond with any of the known systems ofmeasurement used in gauging watch crystals. thumb slide 13 arranged onthe scale, is provided with a window 1a which is for the purpose ofallowing the graduations to be visible. l5 and 16 denote hair lines onthe thumb slide window which are adapted to register with. thegraduations in the operation of gauging a watch crystal. For absoluteaccuracy in the measurements the well known Vernier principle can beapplied to the thumb slide tocooperate with the graduations on thescale.

A flexible band 17 has an enlarged end 18 provided with elongated slots19 by means of which said band is adjustably attached to the scale. Asshown more clearly in Fig. 1. screws 20 pass through the slots to holdthe band to the scale. In the enlarged end pf the flexible band is anopening 21, see Fig: 3, of sufficient size "to freely receive theopposite end, denoted by 22, of the band, which, after being passedthrough opening 21, is attached to one end of the thumb slide asindicated at This arrangement, it will be obvious, forms a hoop 24;which is capable of being expanded and contracted by movement of thethumb slide on the scale. Struck from the hoop portion of the flexibleband is a seriesoi lugs 25 toserve as stops for the edges of the watchcrystal, denoted by 26 in Fig. 4, to be gauged.

The manner in which the gauge is used will be apparent. The thumb slideis moved toward the end of the scale to which the enlarged end of theflexible band is attached until the hoop is sufficiently large to receive the watch crystal. The crystal is inserted and made to restagainst all of the alining stops. The thumb slide is then moved towardthe opposite end of the scale until the hoop engages the entireperimeter of the watch crystal. The hair line registers with thegraduation on the scale which indicates the exact measurement of thewatch crystal.

Having fully described the invention, what I claim is:

l. A gauge for watch crystals comprising a scale, a thumb slide thereon,and a flexible band having its opposite ends attached to said scale andthumb slide, respectively, said flexible band profiled with an openingthrough which one end of said band passes to form a hoop, said openingbeing intermediate the ends of said band and said hoop being expandibleand contractible by movement or said thumb slide on said scale.

2. A gauge for watch crystals comprising a scale, a flexible bandprovided with an enlarged portion adjustably secured to said scale, saidenlarged portion having an opening, and a thumb slide on said scale andprovided with a, hair line adapted to register with graduations on saidscale, said opening being located intermediate the ends of said flexibleband, and said flexible band having all end inserted through saidopening and secured to said thumb slide.

3. A gauge for watch crystals comprising a scale, a flexible bandprovided with an enlarged end adjustably secured to said scale, saidenlarged end provided with c 11 opening, and a thumb slide on said scaleand provided with a hair line adapted to register with graduations onsaid scale, said flexible band having an end inserted through saidopening in said enlarged end and secured through said opening to't'orinan expandible and contractible hoop i'vhose' inner circum ference iscontinuous.

5. A gauge as specified in claim 5, wherein that end of the flexibleband which is attached to the scale is adjustable upon said scale.

Signed at Bridgeport, in the countyof Fairfiel-d and State ofConnecticut, this 7th day of September, A .'D., 1920.

I a MAX GORDON.

Witnesses ,-C. M. NEWMAN,

LILLiAN N. ALLING.

